US20120141845A1 - Rechargeable battery - Google Patents
Rechargeable battery Download PDFInfo
- Publication number
- US20120141845A1 US20120141845A1 US13/077,640 US201113077640A US2012141845A1 US 20120141845 A1 US20120141845 A1 US 20120141845A1 US 201113077640 A US201113077640 A US 201113077640A US 2012141845 A1 US2012141845 A1 US 2012141845A1
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- Prior art keywords
- electrode
- resistance
- rechargeable battery
- cap plate
- plate
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 29
- 229910052759 nickel Inorganic materials 0.000 claims description 14
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000035515 penetration Effects 0.000 abstract description 6
- 239000008151 electrolyte solution Substances 0.000 description 11
- 238000007747 plating Methods 0.000 description 10
- 238000007789 sealing Methods 0.000 description 9
- 229910001374 Invar Inorganic materials 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- aspects of embodiments of the present invention relate to a rechargeable battery.
- a rechargeable battery is capable of being charged and discharged repeatedly.
- a small capacity rechargeable battery may be used for a small electronic device such as a mobile phone, a laptop computer, and a camcorder.
- a large capacity rechargeable battery may be used as a power source for driving a motor of a hybrid vehicle, for example.
- the high power rechargeable battery may be used for a device requiring high power, such as a driving motor of an electric vehicle.
- the rechargeable battery includes an electrode assembly, a case housing the electrode assembly, a cap plate for closing and sealing an opening of the case, and an electrode terminal penetrating the cap plate and electrically connected to the electrode assembly.
- the electrode assembly is formed by winding a positive electrode and a negative electrode with a separator interposed therebetween.
- the rechargeable battery Since the rechargeable battery is charged and discharged repeatedly, heat may be excessively generated inside the case, and the electrolyte solution may decompose. Such heat generation or electrolyte solution decomposition may increase the internal pressure of the rechargeable battery. The increase of the internal pressure may cause ignition and explosion of the rechargeable battery. In order to prevent the ignition and the explosion caused by the increase of the internal pressure, an external short-circuit unit may be disposed at an outside of the case.
- the external short-circuit unit shorts the positive electrode and the negative electrode of the electrode assembly from the outside of the rechargeable battery when the internal pressure of the rechargeable battery increases, thereby reducing a state of charge of the electrode assembly.
- the external short-circuit current may excessively penetrate the electrode assembly because the external short-circuit resistance value is small. Therefore, a safety problem may be caused in the electrode assembly.
- a rechargeable battery has an improved penetration characteristic of an external short-circuit current in an electrode assembly by reducing an external short-circuit current in a case of an external short-circuit.
- a rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case containing the electrode assembly; a cap plate covering an opening of the case; an electrode terminal protruding outside the case and electrically connected to the second electrode; and a resistance member between and electrically connecting the electrode terminal and the cap plate.
- a resistance of the resistance member is greater than a resistance of the electrode terminal.
- the electrode terminal includes a column unit protruding through an opening of the cap plate, and a terminal plate coupled to the column unit outside the case, and the resistance member electrically connects the electrode terminal and the cap plate at the terminal plate.
- the rechargeable battery may further include an insulating gasket surrounding the column unit and insulating the column unit from each of the cap plate and the resistance member.
- the resistance member may include a first protrusion coupled to the cap plate in a groove of the cap plate, and a second protrusion coupled to the terminal plate in a groove of the terminal plate. A resistance of the resistance member may be greater than a resistance of at least one of the column unit, the terminal plate, or the cap plate.
- the resistance member may include at least one of steel, stainless steel, or a nickel steel alloy.
- the resistance member includes a body, and a layer on the body.
- the body may include steel, stainless steel, or a nickel steel alloy, and the layer may include at least one of nickel or tin.
- a resistance of the body and the layer may be greater than a resistance of at least one of the electrode terminal or the cap plate.
- the resistance member includes a first resistance unit contacting the cap plate, and a second resistance unit contacting the electrode terminal.
- the first resistance unit may include a first material
- the second resistance unit may include a second material having a resistance different than a resistance of the first material.
- one of the first and second resistance units includes steel, stainless steel, or a nickel steel alloy
- the other of the first and second resistance units includes aluminum.
- the first resistance unit includes a first protrusion coupled to the cap plate in a groove of the cap plate
- the second resistance unit includes a second protrusion coupled to the electrode terminal in a groove of the electrode terminal.
- a resistance of at least one of the first resistance unit or the second resistance unit may be greater than a resistance of at least one of the electrode terminal or the cap plate.
- a rechargeable battery further includes a short-circuit tab electrically coupled to the first electrode; and a deformable plate electrically coupled to the second electrode and configured to deform and contact the short-circuit tab for short circuiting the first electrode and the second electrode when an internal pressure of the rechargeable battery exceeds a reference pressure.
- the rechargeable battery may further include an insulating member between the cap plate and the short-circuit tab and having an opening over the deformable plate, the deformable plate protruding through the opening to contact the short-circuit tab when the internal pressure of the rechargeable battery exceeds the reference pressure.
- a peripheral portion of the deformable plate may be attached to the cap plate, and an inner portion of the deformable plate inside the peripheral portion may be arranged within an opening of the cap plate.
- the rechargeable battery further includes another electrode terminal protruding outside the case and electrically connected to the first electrode, and the first electrode and the second electrode are short circuited through the resistance member, the cap plate, and the another electrode terminal when the deformable plate contacts the short-circuit tab.
- a second electric connection path formed through the electrode terminal, the resistance member, and the cap plate when the deformable plate contacts the short-circuit tab has a resistance greater than a resistance of a first electric connection path through the electrode terminal.
- a rechargeable battery includes: an electrode assembly having a negative electrode (a first electrode), a positive electrode (a second electrode), and a separator; a case internally housing the electrode assembly; a cap plate connected at an opening of the case, a negative electrode terminal (a first terminal) and a positive electrode terminal (a second terminal) installed at the cap plate and respectively connected to the negative electrode and the positive electrode; a short-circuit tab connected to the negative electrode terminal; a deformable plate separated from the short-circuit tab and connected to the positive electrode terminal; and a resistance member disposed on an electric connection path between the short-circuit member and the positive electrode terminal and having an electrical resistance value higher than electrical resistance values of other elements on the electric connection path.
- the resistance member having high electrical resistance value is disposed on an electric connection path between the deformable plate and the positive electrode terminal.
- the external short-circuit current is reduced by increasing the external short-circuit resistance value. Therefore, the penetration characteristic of the external short-circuit current penetrating the electrode assembly is improved.
- FIG. 1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the rechargeable battery of FIG. 1 taken along the line II-II.
- FIG. 3 is a cross-sectional view illustrating a separation state of a short-circuit tab and a deformable plate of the rechargeable battery of FIG. 1 .
- FIG. 4 is a cross-sectional view illustrating a short-circuit state of the short-circuit tab and the deformable plate of FIG. 3 .
- FIG. 5 is an exploded perspective view of an electrode terminal and a cap plate of the rechargeable battery of FIG. 1 .
- FIG. 6 is a cross-sectional view of the electrode terminal and the cap plate of FIG. 5 taken along the line VI-VI.
- FIG. 7 is a cross-sectional view of an electrode terminal and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.
- FIG. 8 is an exploded perspective view of an electrode terminal and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.
- FIG. 9 is a cross-sectional view of the electrode terminal and the cap plate of FIG. 8 taken along the line IX-IX.
- electrode assembly 11 first electrode 11a, 12a: uncoated region 12: second electrode 13: separator 15: case 20: cap plate 21: first electrode terminal 22: second electrode terminal 21a, 22a: column unit 21b, 22b: flange 21d, 22d: terminal plate 23: short-circuit hole 24: vent hole 25: vent plate 25a: notch 27: sealing stopper 29: electrolyte solution inlet 31: first electrode lead tab 36: first electrode gasket 37: insulating member 39: second electrode gasket 51: short-circuit tab 53: deformable plate 70, 270, 370: resistance member 71: downward protrusion 72, 74: groove 73: upward protrusion 100, 200, 400: rechargeable battery 271: main body 272: plating layer 371, 372: first and second resistance units L1, L2: first and second connection paths
- FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the rechargeable battery shown in FIG. 1 taken along the line II-II.
- a rechargeable battery 100 according to an exemplary embodiment includes an electrode assembly 10 , a case 15 housing the electrode assembly 10 , a cap plate 20 connected to an opening of the case 15 , a first electrode terminal 21 (e.g., a negative electrode terminal) connected to the cap plate 20 , and a second electrode terminal 22 (e.g., a positive electrode terminal).
- the electrode assembly 10 is formed by disposing a first electrode 11 (e.g., a negative electrode) and a second electrode 12 (e.g., a positive electrode) at both sides of a separator 13 , which is an insulator, and winding the first electrode 11 , the separator 13 , and the second electrode 12 in a jelly roll shape.
- the electrode assembly 10 may be assembled by stacking a negative electrode and a positive electrode formed of a single plate with a separator interleaved therebetween or assembled by folding and stacking the negative electrode, the separator, and the positive electrode in a zigzag manner (not shown).
- the first electrode 11 and the second electrode 12 include coated regions formed of a metal plate current collector coated with active material, and uncoated regions 11 a and 12 a formed of an exposed current collector where active material is not coated.
- the uncoated region 11 a of the first electrode 11 is formed at one end of the first electrode 11 along the wound first electrode 11
- the uncoated region 12 a of the second electrode 12 is formed at one end of the second electrode 12 along the wound second electrode 12
- the uncoated regions 11 a and 12 a are disposed at both ends of the electrode assembly 10 .
- the case 15 in one embodiment, is formed having a cuboid shape to form an internal space for housing the electrode assembly 10 and electrolyte solution and includes an opening at one side of the cuboid to connect the outside and the inside. The opening permits the electrode assembly 10 to be inserted inside the case 15 .
- the cap plate 20 in one embodiment, is formed of a thin plate and is installed at the opening of the case 15 for closing and sealing the case 15 .
- the cap plate 20 in one embodiment, further includes an electrolyte solution inlet 29 and a vent hole 24 .
- the electrolyte solution inlet 29 permits injecting electrolyte solution inside the case 15 after connecting the cap plate 20 to the case 15 . After injecting the electrolyte solution, the electrolyte solution inlet 29 is sealed with a sealing stopper 27 .
- the vent hole 24 permits discharging of internal pressure of the rechargeable battery 100 .
- the vent hole 24 is closed and sealed with a vent plate 25 .
- the vent plate 25 is opened when an internal pressure of the rechargeable battery 100 reaches a predetermined pressure.
- the vent plate 25 in one embodiment, includes a notch 25 a to lead to an opening.
- the first electrode terminal 21 and the second electrode terminal 22 are installed by penetrating the cap plate 20 and are electrically connected to the electrode assembly 10 .
- the first electrode terminal 21 is electrically connected to the first electrode 11 of the electrode assembly 10
- the second electrode terminal 22 is electrically connected to the second electrode 12 . Therefore, the electrode assembly 10 draws out to the outside of the case 15 through the first electrode terminal 21 and the second electrode terminal 22 .
- the first electrode terminal 21 in one embodiment, includes a column unit 21 a installed at a terminal hole of the cap plate 20 , a flange 21 b formed from an inner side of the case 15 at the column unit 21 a , and a terminal plate 21 d disposed at an outer side of the case 15 and connected to the column unit 21 a.
- a first electrode gasket 36 (e.g., a negative electrode gasket) is installed between the column unit 21 a of the first electrode terminal 21 and an inner side of the terminal hole of the cap plate 20 , thereby sealing between the column unit 21 a of the first electrode terminal 21 and the cap plate 20 .
- the first electrode gasket 36 in one embodiment, further extends between the flange 21 b and the cap plate 20 , thereby further sealing the flange 21 b and the cap plate 20 . That is, the first electrode gasket 36 prevents or substantially prevents electrolyte solution from leaking through the terminal hole where the first electrode terminal 21 is installed at the cap plate 20 .
- a first electrode lead tab 31 (e.g., a negative electrode lead tab) electrically connects the first electrode terminal 21 to the first electrode 11 of the electrode assembly 10 .
- the first electrode lead tab 31 is connected to a lower end of the column unit 21 a for caulking the lower end.
- the first electrode lead tab 31 is connected to the lower end of the column unit 21 a while being supported at the flange 21 b .
- a first electrode insulating member 41 e.g., a negative electrode insulating member is installed between the first electrode lead tab 31 and the cap plate 20 and electrically insulates the first electrode lead tab 31 and the cap plate 20 .
- FIG. 3 is a cross-sectional view illustrating a separation state of a short-circuit tab and a deformable plate of the rechargeable battery 100 .
- FIG. 4 is a cross-sectional view illustrating a short-circuit state of the short-circuit tab and the deformable plate shown in FIG. 3 .
- the rechargeable battery 100 according to an exemplary embodiment includes an external short-circuit unit installed at the first electrode terminal 21 .
- the external short-circuit unit short circuits the first electrode 11 and the second electrode 12 from the outside of the case 15 when an internal pressure inside the case 15 increases.
- the external short-circuit unit includes a short-circuit tab 51 and a deformable plate 53 , which are separated or short-circuited according to the internal pressure.
- the short-circuit tab 51 is disposed at the outside of the cap plate 20 and is electrically connected to the first electrode terminal 21 .
- the short-circuit tab 51 in one embodiment, penetrates the column unit 21 a from the outside of the case 15 and is stacked with the terminal plate 21 d.
- An insulating member 37 is installed between the short-circuit tab 51 and the cap plate 20 and electrically insulates the short-circuit tab 51 and the cap plate 20 .
- the cap plate 20 in one embodiment, is electrically connected to the second electrode terminal 22 .
- the insulating member 37 in one embodiment, further extends between the column unit 21 a of the first electrode terminal 21 and an inner side of the terminal hole of the cap plate 20 from the upper part of the first electrode gasket 36 , thereby further electrically insulating between the column unit 21 a of the first electrode terminal 21 and the cap plate 20 .
- the short-circuit tab 51 and the terminal plate 21 d are connected to an upper part of the column unit 21 a by caulking the upper part by stacking and coupling the short-circuit tab 51 and the terminal plate 21 d at the upper part of the column unit 21 a of the first electrode terminal 21 .
- the short-circuit tab 51 and the terminal plate 21 d are supported by the cap plate 20 with the insulating member 37 interleaved between the short-circuit tab 51 and the cap plate 20 .
- the deformable plate 53 is deformed and contacts the short-circuit tab 51 when the internal pressure of the rechargeable battery 100 increases.
- the short-circuit tab 51 is electrically connected to the cap plate 21 so as to maintain the short-circuit state of the electrode assembly 10 .
- the deformable plate 53 is installed at a short-circuit hole 23 of the cap plate 20 .
- the short-circuit tab 51 is connected to the first electrode terminal 21 and extends toward the deformable plate 53 .
- the short-circuit tab 51 and the deformable plate 53 face each other and sustain either a separation state (see FIG. 3 ) when the internal pressure of the rechargeable battery 100 is less than a reference pressure, or a short-circuit state (see FIG. 4 ) when the internal pressure is greater than a reference pressure.
- the deformable plate 53 is disposed between the insulating member 37 and the cap plate 20 in the short-circuit hole 23 and an insulating member hole 37 a .
- the deformable plate 53 in one embodiment, is formed to have an arc-shaped cross-section that is convex toward the inner side of the case 15 , and is electrically connected to the cap plate 20 .
- the deformable plate 53 is reversed and protruded to the outside of the cap plate 20 through the short-circuit hole 23 (see FIG. 4 ) and contacts and is electrically connected to the short-circuit tab 51 , and the short-circuit tab 51 is therefore electrically connected to the cap plate 20 . That is, the first electrode 11 of the electrode assembly 10 is short-circuited with the second electrode 12 . When the first electrode 11 and the second electrode 21 are short-circuited, a large amount of current instantly flows between the first electrode terminal 21 and the second electrode terminal 22 through the short-circuit tab 51 and the second electrode terminal 22 . Accordingly, the electrode assembly 10 is discharged.
- the rechargeable battery 100 further includes a structure that improves pass characteristic by reducing the external short-circuit current passing through the electrode assembly 10 .
- the rechargeable battery 100 according to an exemplary embodiment has a configuration increasing an external short-circuit resistance value in order to reduce the external short-circuit current.
- the rechargeable battery 100 further includes a resistance member 70 disposed on an electric connection path of the deformable plate 53 and the second electrode terminal 22 .
- the resistance member 70 in one embodiment, has a greater electrical resistance value than other constituent elements of the electric connection path.
- FIG. 5 is an exploded perspective view illustrating a disassembled state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of the rechargeable battery 100 .
- the second electrode terminal 22 includes a column unit 22 a installed at a terminal hole 20 a of the cap plate 20 , a flange 22 b formed at the column unit 22 a inside the case 15 , and a resistance member 70 and a terminal plate 22 d stacked and coupled at the column unit 22 a and being disposed outside the case 15 .
- a second electrode gasket 39 (e.g., a positive electrode gasket) is installed between the column unit 22 a of the second electrode terminal 22 and an inner side of the terminal hole 20 a of the cap plate 20 , sealing between the column unit 22 a of the second electrode terminal 22 and the cap plate 20 .
- the second electrode gasket 39 in one embodiment, further extends between the flange 22 b and the cap plate 20 , thereby further sealing between the flange 22 b and the cap plate 20 .
- the second electrode gasket 39 further extends between the column unit 22 a of the second electrode terminal 22 and an inner side of a hole of the resistance member 70 , thereby sealing between the column unit 22 a of the second electrode terminal 22 and an inner side of a hole of the resistance member 70 .
- the second electrode gasket 39 prevents or substantially prevents electrolyte solution from leaking through a terminal hole by installing the positive electrode terminal 22 at the cap plate 20 .
- a second electrode lead tab 32 (e.g., a positive electrode lead tab) electrically connects the second electrode terminal 22 to the electrode assembly 10 .
- the second electrode lead tab 32 is coupled to a lower end of the column unit 22 a for caulking the lower end. Accordingly, the second electrode lead tab 32 is coupled to the lower end of the column 22 a while being supported by the flange 22 b .
- a second electrode insulating member 42 (e.g., a positive electrode insulating member) is disposed between the second electrode lead tab 32 and the cap plate 20 and electrically insulates the second electrode lead tab 32 and the cap plate 20 .
- FIG. 6 is a cross-sectional view illustrating a connected state of the electrode terminal and the cap plate of FIG. 5 taken along the line VI-VI.
- the resistance member 70 and the terminal plate 22 d are connected to an upper end of the column unit 22 a by stacking and connecting the resistance member 70 and the terminal plate 22 d at the upper end of the column unit 22 a of the second electrode terminal 22 for caulking the upper end. Therefore, the resistance member 70 and the terminal plate 22 d are supported by the cap plate 20 .
- the resistance member 70 electrically connects the cap plate 20 and the column unit 22 a.
- the resistance member 70 in one embodiment, includes a downward protrusion 71 facing the cap plate 20 , and an upward protrusion 73 facing the terminal plate 22 d .
- the downward protrusion 71 is coupled in a groove 72 of the cap plate 20 and the upward protrusion 73 is coupled to a groove 74 of the terminal plate 22 d in an assembled state in which the second electrode terminal 22 penetrates the cap plate 20 .
- the downward protrusion 71 and the groove 72 facilitate setting up an installation location of the resistance member 70 on the cap plate 20 .
- the upward protrusion 73 and the groove 74 facilitate setting up an installation location of the terminal plate 22 d on the resistance member 70 .
- the deformable plate 53 and the second electrode terminal 22 form an electric connection path therebetween through the cap plate 20 and the resistance member 70 .
- the resistance member 70 increases the external short-circuit resistance value between the first electrode terminal 21 and the second electrode terminal 22 without influencing the output through the first electrode terminal 21 and the second electrode terminal 22 , thereby reducing the external short-circuit current.
- the resistance member 70 in one embodiment, has a resistance value higher than that of the column unit 22 a , the terminal plate 22 d , and the cap plate 20 .
- the terminal plate 22 d is formed of aluminum
- the resistance member 70 is formed of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar (Invar is a registered trademark of Imphy Alloys), also referred to as FeNi36 or 64FeNi.
- a first electric connection path L 1 (see FIG. 6 ) is formed between the column unit 22 a of the second electrode terminal 22 and the terminal plate 22 d .
- the resistance member 70 does not influence the output of the rechargeable battery 100 despite the high resistance value of the resistance member 70 .
- a second electric connection path L 2 (see FIG. 6 ) is formed through the column unit 22 a of the second electrode terminal 22 , the terminal plate 22 d , the resistance member 70 , and the cap plate 20 .
- the resistance member 70 reduces the external short-circuit current by increasing the external short-circuit resistance value of the externally short-circuited rechargeable battery 100 . Therefore, the penetration characteristic of the external short-circuit current may be stabilized.
- the external short-circuit current penetrates the electrode assembly 10 .
- a rechargeable battery according to another exemplary embodiment of the present invention is described below.
- the rechargeable battery 100 only elements of the another exemplary embodiment differing from those of the rechargeable battery 100 will be described, and description of same elements will not be repeated.
- FIG. 7 is a cross-sectional view illustrating a connected state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.
- an electrode terminal e.g., a positive electrode terminal
- a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.
- a rechargeable battery 200 includes a resistance member 270 including a main body 271 and a plating layer 272 formed on a surface of the main body 271 .
- the main body 271 in one embodiment, is made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar.
- the plating layer 272 in one embodiment, may be made of nickel (Ni) and/or tin (Sn). In the resistance member 270 , the plating layer 272 prevents or substantially prevents the main body 271 from corroding.
- the first electric connection path L 1 is formed between the column unit 22 a of the second electrode terminal 22 and the terminal plate 22 d .
- the main body 271 and the plating layer 272 do not influence the output of the normally operating rechargeable battery 200 although the main body 271 and the plating layer 272 have an electrical resistance value higher than the column unit 22 a , the terminal plate 22 d , and the cap plate 20 .
- the second electric connection path L 2 is formed through the column unit 22 a of the second electrode terminal 22 , the terminal plate 22 d , the main body 271 , the plating layer 272 , and the cap plate 20 .
- the main body 271 and the plating layer 272 reduce the external short-circuit current by increasing the external short-circuit resistance value of the externally short-circuited rechargeable battery 200 . Therefore, the penetration characteristic of the external short-circuit current penetrating the electrode assembly 10 is stabilized.
- FIG. 8 is an exploded perspective view illustrating a disassembled state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.
- FIG. 9 is a cross-sectional view illustrating a connected state of the electrode terminal and the cap plate of FIG. 8 taken along the line IX-IX.
- a rechargeable battery 400 includes a first resistance unit 371 and a second resistance unit 372 made of different materials.
- the first resistance unit 371 may be made of aluminum
- the second resistance unit 372 may be made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar, having an electrical resistance value higher than that of the first resistance unit 371 .
- the second resistance unit 372 has an electrical resistance value higher than the electrical resistance values of the column unit 22 a , the terminal plate 22 d , and the cap plate 20 .
- the first resistance unit 371 may be made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar
- the second resistance unit may be made of aluminum.
- At least one of the first and second resistance units 371 and 372 may include a plating layer (e.g., a nickel and/or tin plating layer) on a main body, such as described above with respect to the resistance member 270 .
- a plating layer e.g., a nickel and/or tin plating layer
- the first resistance unit 371 is connected to the cap plate 20 through a downward protrusion 71 facing the cap plate 20
- the second resistance unit 372 is coupled to the terminal plate 22 d through an upward protrusion 73 facing the terminal plate 22 d
- the downward protrusion 71 and the groove 72 facilitate an installation location of the first resistance unit 371 on the cap plate 20
- the upward protrusion 73 and the groove 74 facilitate an installation location of the terminal plate 22 d on the second resistance unit 372 .
- the first electric connection path L 1 is formed between the column unit 22 a of the second electrode terminal 22 and the terminal plate 22 d when the rechargeable battery 400 normally operates.
- the first and second resistance units 371 and 372 in one embodiment, do not influence the output of the normally operating rechargeable battery 400 despite the high electrical resistance value of the first and second resistance units 371 and 372 .
- the second electric connection path L 2 is formed through the column unit 22 a of the second electrode terminal 22 , the terminal plate 22 d , the first and second resistance units 371 and 372 , and the cap plate 20 .
- the first and second resistance units 371 and 372 reduce the external short-circuit current by increasing the external short-circuit resistance value of the externally short-circuited rechargeable battery 400 . Accordingly, the penetration characteristic of the external short-circuit current penetrating the electrode assembly 10 may be stabilized.
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Abstract
Description
- This application claims the benefit of U.S. Provisional Application No. 61/419,221, filed on Dec. 2, 2010 in the United States Patent and Trademark Office, the disclosure of which is incorporated herein in its entirety by reference.
- 1. Field
- Aspects of embodiments of the present invention relate to a rechargeable battery.
- 2. Description of the Related Art
- Unlike a primary battery, a rechargeable battery is capable of being charged and discharged repeatedly. A small capacity rechargeable battery may be used for a small electronic device such as a mobile phone, a laptop computer, and a camcorder. A large capacity rechargeable battery may be used as a power source for driving a motor of a hybrid vehicle, for example.
- Recently, a high power rechargeable battery using high energy density non-aqueous electrolyte has been developed. The high power rechargeable battery may be used for a device requiring high power, such as a driving motor of an electric vehicle.
- The rechargeable battery includes an electrode assembly, a case housing the electrode assembly, a cap plate for closing and sealing an opening of the case, and an electrode terminal penetrating the cap plate and electrically connected to the electrode assembly. Here, the electrode assembly is formed by winding a positive electrode and a negative electrode with a separator interposed therebetween.
- Since the rechargeable battery is charged and discharged repeatedly, heat may be excessively generated inside the case, and the electrolyte solution may decompose. Such heat generation or electrolyte solution decomposition may increase the internal pressure of the rechargeable battery. The increase of the internal pressure may cause ignition and explosion of the rechargeable battery. In order to prevent the ignition and the explosion caused by the increase of the internal pressure, an external short-circuit unit may be disposed at an outside of the case.
- The external short-circuit unit shorts the positive electrode and the negative electrode of the electrode assembly from the outside of the rechargeable battery when the internal pressure of the rechargeable battery increases, thereby reducing a state of charge of the electrode assembly. However, the external short-circuit current may excessively penetrate the electrode assembly because the external short-circuit resistance value is small. Therefore, a safety problem may be caused in the electrode assembly.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
- According to an aspect of embodiments of the present invention, a rechargeable battery has an improved penetration characteristic of an external short-circuit current in an electrode assembly by reducing an external short-circuit current in a case of an external short-circuit.
- According to an exemplary embodiment of the present invention, a rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case containing the electrode assembly; a cap plate covering an opening of the case; an electrode terminal protruding outside the case and electrically connected to the second electrode; and a resistance member between and electrically connecting the electrode terminal and the cap plate.
- In one embodiment, a resistance of the resistance member is greater than a resistance of the electrode terminal.
- In one embodiment, the electrode terminal includes a column unit protruding through an opening of the cap plate, and a terminal plate coupled to the column unit outside the case, and the resistance member electrically connects the electrode terminal and the cap plate at the terminal plate. The rechargeable battery may further include an insulating gasket surrounding the column unit and insulating the column unit from each of the cap plate and the resistance member. The resistance member may include a first protrusion coupled to the cap plate in a groove of the cap plate, and a second protrusion coupled to the terminal plate in a groove of the terminal plate. A resistance of the resistance member may be greater than a resistance of at least one of the column unit, the terminal plate, or the cap plate.
- The resistance member may include at least one of steel, stainless steel, or a nickel steel alloy.
- In one embodiment, the resistance member includes a body, and a layer on the body. The body may include steel, stainless steel, or a nickel steel alloy, and the layer may include at least one of nickel or tin. A resistance of the body and the layer may be greater than a resistance of at least one of the electrode terminal or the cap plate.
- In one embodiment, the resistance member includes a first resistance unit contacting the cap plate, and a second resistance unit contacting the electrode terminal. The first resistance unit may include a first material, and the second resistance unit may include a second material having a resistance different than a resistance of the first material. In one embodiment, one of the first and second resistance units includes steel, stainless steel, or a nickel steel alloy, and the other of the first and second resistance units includes aluminum. In one embodiment, the first resistance unit includes a first protrusion coupled to the cap plate in a groove of the cap plate, and the second resistance unit includes a second protrusion coupled to the electrode terminal in a groove of the electrode terminal. A resistance of at least one of the first resistance unit or the second resistance unit may be greater than a resistance of at least one of the electrode terminal or the cap plate.
- In one embodiment, a rechargeable battery further includes a short-circuit tab electrically coupled to the first electrode; and a deformable plate electrically coupled to the second electrode and configured to deform and contact the short-circuit tab for short circuiting the first electrode and the second electrode when an internal pressure of the rechargeable battery exceeds a reference pressure. The rechargeable battery may further include an insulating member between the cap plate and the short-circuit tab and having an opening over the deformable plate, the deformable plate protruding through the opening to contact the short-circuit tab when the internal pressure of the rechargeable battery exceeds the reference pressure. A peripheral portion of the deformable plate may be attached to the cap plate, and an inner portion of the deformable plate inside the peripheral portion may be arranged within an opening of the cap plate.
- In one embodiment, the rechargeable battery further includes another electrode terminal protruding outside the case and electrically connected to the first electrode, and the first electrode and the second electrode are short circuited through the resistance member, the cap plate, and the another electrode terminal when the deformable plate contacts the short-circuit tab. In one embodiment, a second electric connection path formed through the electrode terminal, the resistance member, and the cap plate when the deformable plate contacts the short-circuit tab has a resistance greater than a resistance of a first electric connection path through the electrode terminal.
- According to another exemplary embodiment of the present invention, a rechargeable battery includes: an electrode assembly having a negative electrode (a first electrode), a positive electrode (a second electrode), and a separator; a case internally housing the electrode assembly; a cap plate connected at an opening of the case, a negative electrode terminal (a first terminal) and a positive electrode terminal (a second terminal) installed at the cap plate and respectively connected to the negative electrode and the positive electrode; a short-circuit tab connected to the negative electrode terminal; a deformable plate separated from the short-circuit tab and connected to the positive electrode terminal; and a resistance member disposed on an electric connection path between the short-circuit member and the positive electrode terminal and having an electrical resistance value higher than electrical resistance values of other elements on the electric connection path.
- According to another exemplary embodiment of the present invention, the resistance member having high electrical resistance value is disposed on an electric connection path between the deformable plate and the positive electrode terminal. According to an aspect of embodiments of the present invention, the external short-circuit current is reduced by increasing the external short-circuit resistance value. Therefore, the penetration characteristic of the external short-circuit current penetrating the electrode assembly is improved.
- The above and other features and advantages will become more apparent to those of ordinary skill in the art by describing in detail some exemplary embodiments of the present invention with reference to the attached drawings. Moreover, additional aspects and/or advantages of embodiments of the present invention are set forth in the following description and accompanying drawings, or may be obvious in view thereof to those skilled in the art.
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FIG. 1 is a perspective view of a rechargeable battery according to an exemplary embodiment of the present invention. -
FIG. 2 is a cross-sectional view of the rechargeable battery ofFIG. 1 taken along the line II-II. -
FIG. 3 is a cross-sectional view illustrating a separation state of a short-circuit tab and a deformable plate of the rechargeable battery ofFIG. 1 . -
FIG. 4 is a cross-sectional view illustrating a short-circuit state of the short-circuit tab and the deformable plate ofFIG. 3 . -
FIG. 5 is an exploded perspective view of an electrode terminal and a cap plate of the rechargeable battery ofFIG. 1 . -
FIG. 6 is a cross-sectional view of the electrode terminal and the cap plate ofFIG. 5 taken along the line VI-VI. -
FIG. 7 is a cross-sectional view of an electrode terminal and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention. -
FIG. 8 is an exploded perspective view of an electrode terminal and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention. -
FIG. 9 is a cross-sectional view of the electrode terminal and the cap plate ofFIG. 8 taken along the line IX-IX. -
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10: electrode assembly 11: first electrode 11a, 12a: uncoated region 12: second electrode 13: separator 15: case 20: cap plate 21: first electrode terminal 22: second electrode terminal 21a, 22a: column unit 21b, 22b: flange 21d, 22d: terminal plate 23: short-circuit hole 24: vent hole 25: vent plate 25a: notch 27: sealing stopper 29: electrolyte solution inlet 31: first electrode lead tab 36: first electrode gasket 37: insulating member 39: second electrode gasket 51: short-circuit tab 53: deformable plate 70, 270, 370: resistance member 71: downward protrusion 72, 74: groove 73: upward protrusion 100, 200, 400: rechargeable battery 271: main body 272: plating layer 371, 372: first and second resistance units L1, L2: first and second connection paths - Hereinafter, the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which some exemplary embodiments of the invention are shown. However, embodiments of the present invention may be embodied in different forms and should not be construed as limited to the exemplary embodiments illustrated and set forth herein. Rather, these exemplary embodiments are provided by way of example for understanding of the invention and to convey the scope of the invention to those skilled in the art. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. The drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.
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FIG. 1 is a perspective view illustrating a rechargeable battery according to an exemplary embodiment of the present invention.FIG. 2 is a cross-sectional view of the rechargeable battery shown inFIG. 1 taken along the line II-II. Referring toFIG. 1 andFIG. 2 , arechargeable battery 100 according to an exemplary embodiment includes anelectrode assembly 10, acase 15 housing theelectrode assembly 10, acap plate 20 connected to an opening of thecase 15, a first electrode terminal 21 (e.g., a negative electrode terminal) connected to thecap plate 20, and a second electrode terminal 22 (e.g., a positive electrode terminal). - In one embodiment, the
electrode assembly 10 is formed by disposing a first electrode 11 (e.g., a negative electrode) and a second electrode 12 (e.g., a positive electrode) at both sides of aseparator 13, which is an insulator, and winding thefirst electrode 11, theseparator 13, and thesecond electrode 12 in a jelly roll shape. Alternatively, theelectrode assembly 10 may be assembled by stacking a negative electrode and a positive electrode formed of a single plate with a separator interleaved therebetween or assembled by folding and stacking the negative electrode, the separator, and the positive electrode in a zigzag manner (not shown). - The
first electrode 11 and thesecond electrode 12 include coated regions formed of a metal plate current collector coated with active material, anduncoated regions uncoated region 11 a of thefirst electrode 11 is formed at one end of thefirst electrode 11 along the woundfirst electrode 11, and theuncoated region 12 a of thesecond electrode 12 is formed at one end of thesecond electrode 12 along the woundsecond electrode 12. Theuncoated regions electrode assembly 10. - The
case 15, in one embodiment, is formed having a cuboid shape to form an internal space for housing theelectrode assembly 10 and electrolyte solution and includes an opening at one side of the cuboid to connect the outside and the inside. The opening permits theelectrode assembly 10 to be inserted inside thecase 15. - The
cap plate 20, in one embodiment, is formed of a thin plate and is installed at the opening of thecase 15 for closing and sealing thecase 15. Thecap plate 20, in one embodiment, further includes anelectrolyte solution inlet 29 and avent hole 24. Theelectrolyte solution inlet 29 permits injecting electrolyte solution inside thecase 15 after connecting thecap plate 20 to thecase 15. After injecting the electrolyte solution, theelectrolyte solution inlet 29 is sealed with a sealingstopper 27. - The
vent hole 24 permits discharging of internal pressure of therechargeable battery 100. Thevent hole 24 is closed and sealed with avent plate 25. Thevent plate 25 is opened when an internal pressure of therechargeable battery 100 reaches a predetermined pressure. Thevent plate 25, in one embodiment, includes anotch 25 a to lead to an opening. - The
first electrode terminal 21 and thesecond electrode terminal 22, in one embodiment, are installed by penetrating thecap plate 20 and are electrically connected to theelectrode assembly 10. In one embodiment, thefirst electrode terminal 21 is electrically connected to thefirst electrode 11 of theelectrode assembly 10, and thesecond electrode terminal 22 is electrically connected to thesecond electrode 12. Therefore, theelectrode assembly 10 draws out to the outside of thecase 15 through thefirst electrode terminal 21 and thesecond electrode terminal 22. - The
first electrode terminal 21, in one embodiment, includes acolumn unit 21 a installed at a terminal hole of thecap plate 20, aflange 21 b formed from an inner side of thecase 15 at thecolumn unit 21 a, and aterminal plate 21 d disposed at an outer side of thecase 15 and connected to thecolumn unit 21 a. - In one embodiment, a first electrode gasket 36 (e.g., a negative electrode gasket) is installed between the
column unit 21 a of thefirst electrode terminal 21 and an inner side of the terminal hole of thecap plate 20, thereby sealing between thecolumn unit 21 a of thefirst electrode terminal 21 and thecap plate 20. Thefirst electrode gasket 36, in one embodiment, further extends between theflange 21 b and thecap plate 20, thereby further sealing theflange 21 b and thecap plate 20. That is, thefirst electrode gasket 36 prevents or substantially prevents electrolyte solution from leaking through the terminal hole where thefirst electrode terminal 21 is installed at thecap plate 20. - A first electrode lead tab 31 (e.g., a negative electrode lead tab) electrically connects the
first electrode terminal 21 to thefirst electrode 11 of theelectrode assembly 10. In one embodiment, the firstelectrode lead tab 31 is connected to a lower end of thecolumn unit 21 a for caulking the lower end. The firstelectrode lead tab 31 is connected to the lower end of thecolumn unit 21 a while being supported at theflange 21 b. In one embodiment, a first electrode insulating member 41 (e.g., a negative electrode insulating member) is installed between the firstelectrode lead tab 31 and thecap plate 20 and electrically insulates the firstelectrode lead tab 31 and thecap plate 20. -
FIG. 3 is a cross-sectional view illustrating a separation state of a short-circuit tab and a deformable plate of therechargeable battery 100.FIG. 4 is a cross-sectional view illustrating a short-circuit state of the short-circuit tab and the deformable plate shown inFIG. 3 . Referring toFIG. 3 andFIG. 4 , therechargeable battery 100 according to an exemplary embodiment includes an external short-circuit unit installed at thefirst electrode terminal 21. The external short-circuit unit short circuits thefirst electrode 11 and thesecond electrode 12 from the outside of thecase 15 when an internal pressure inside thecase 15 increases. In one embodiment, the external short-circuit unit includes a short-circuit tab 51 and adeformable plate 53, which are separated or short-circuited according to the internal pressure. - Referring to
FIG. 1 andFIG. 2 again, in one embodiment, the short-circuit tab 51 is disposed at the outside of thecap plate 20 and is electrically connected to thefirst electrode terminal 21. The short-circuit tab 51, in one embodiment, penetrates thecolumn unit 21 a from the outside of thecase 15 and is stacked with theterminal plate 21 d. - An insulating
member 37 is installed between the short-circuit tab 51 and thecap plate 20 and electrically insulates the short-circuit tab 51 and thecap plate 20. Thecap plate 20, in one embodiment, is electrically connected to thesecond electrode terminal 22. - The insulating
member 37, in one embodiment, further extends between thecolumn unit 21 a of thefirst electrode terminal 21 and an inner side of the terminal hole of thecap plate 20 from the upper part of thefirst electrode gasket 36, thereby further electrically insulating between thecolumn unit 21 a of thefirst electrode terminal 21 and thecap plate 20. - The short-
circuit tab 51 and theterminal plate 21 d are connected to an upper part of thecolumn unit 21 a by caulking the upper part by stacking and coupling the short-circuit tab 51 and theterminal plate 21 d at the upper part of thecolumn unit 21 a of thefirst electrode terminal 21. In one embodiment, the short-circuit tab 51 and theterminal plate 21 d are supported by thecap plate 20 with the insulatingmember 37 interleaved between the short-circuit tab 51 and thecap plate 20. - The
deformable plate 53 is deformed and contacts the short-circuit tab 51 when the internal pressure of therechargeable battery 100 increases. When thedeformable plate 53 contacts the short-circuit tab 51, the short-circuit tab 51 is electrically connected to thecap plate 21 so as to maintain the short-circuit state of theelectrode assembly 10. For this purpose, thedeformable plate 53 is installed at a short-circuit hole 23 of thecap plate 20. The short-circuit tab 51 is connected to thefirst electrode terminal 21 and extends toward thedeformable plate 53. In the short-circuit hole 23, the short-circuit tab 51 and thedeformable plate 53 face each other and sustain either a separation state (seeFIG. 3 ) when the internal pressure of therechargeable battery 100 is less than a reference pressure, or a short-circuit state (seeFIG. 4 ) when the internal pressure is greater than a reference pressure. - In one embodiment, the
deformable plate 53 is disposed between the insulatingmember 37 and thecap plate 20 in the short-circuit hole 23 and an insulating member hole 37 a. Thedeformable plate 53, in one embodiment, is formed to have an arc-shaped cross-section that is convex toward the inner side of thecase 15, and is electrically connected to thecap plate 20. - When the internal pressure of the
case 15 increases, thedeformable plate 53 is reversed and protruded to the outside of thecap plate 20 through the short-circuit hole 23 (seeFIG. 4 ) and contacts and is electrically connected to the short-circuit tab 51, and the short-circuit tab 51 is therefore electrically connected to thecap plate 20. That is, thefirst electrode 11 of theelectrode assembly 10 is short-circuited with thesecond electrode 12. When thefirst electrode 11 and thesecond electrode 21 are short-circuited, a large amount of current instantly flows between thefirst electrode terminal 21 and thesecond electrode terminal 22 through the short-circuit tab 51 and thesecond electrode terminal 22. Accordingly, theelectrode assembly 10 is discharged. - The
rechargeable battery 100 according to an exemplary embodiment further includes a structure that improves pass characteristic by reducing the external short-circuit current passing through theelectrode assembly 10. Therechargeable battery 100 according to an exemplary embodiment has a configuration increasing an external short-circuit resistance value in order to reduce the external short-circuit current. In one embodiment, as shown inFIG. 2 , therechargeable battery 100 further includes aresistance member 70 disposed on an electric connection path of thedeformable plate 53 and thesecond electrode terminal 22. Theresistance member 70, in one embodiment, has a greater electrical resistance value than other constituent elements of the electric connection path. -
FIG. 5 is an exploded perspective view illustrating a disassembled state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of therechargeable battery 100. Referring toFIG. 1 ,FIG. 2 , andFIG. 5 , thesecond electrode terminal 22 includes acolumn unit 22 a installed at aterminal hole 20 a of thecap plate 20, aflange 22 b formed at thecolumn unit 22 a inside thecase 15, and aresistance member 70 and aterminal plate 22 d stacked and coupled at thecolumn unit 22 a and being disposed outside thecase 15. - In one embodiment, a second electrode gasket 39 (e.g., a positive electrode gasket) is installed between the
column unit 22 a of thesecond electrode terminal 22 and an inner side of theterminal hole 20 a of thecap plate 20, sealing between thecolumn unit 22 a of thesecond electrode terminal 22 and thecap plate 20. Thesecond electrode gasket 39, in one embodiment, further extends between theflange 22 b and thecap plate 20, thereby further sealing between theflange 22 b and thecap plate 20. In one embodiment, thesecond electrode gasket 39 further extends between thecolumn unit 22 a of thesecond electrode terminal 22 and an inner side of a hole of theresistance member 70, thereby sealing between thecolumn unit 22 a of thesecond electrode terminal 22 and an inner side of a hole of theresistance member 70. Thesecond electrode gasket 39 prevents or substantially prevents electrolyte solution from leaking through a terminal hole by installing thepositive electrode terminal 22 at thecap plate 20. - A second electrode lead tab 32 (e.g., a positive electrode lead tab) electrically connects the
second electrode terminal 22 to theelectrode assembly 10. In one embodiment, the secondelectrode lead tab 32 is coupled to a lower end of thecolumn unit 22 a for caulking the lower end. Accordingly, the secondelectrode lead tab 32 is coupled to the lower end of thecolumn 22 a while being supported by theflange 22 b. In one embodiment, a second electrode insulating member 42 (e.g., a positive electrode insulating member) is disposed between the secondelectrode lead tab 32 and thecap plate 20 and electrically insulates the secondelectrode lead tab 32 and thecap plate 20. -
FIG. 6 is a cross-sectional view illustrating a connected state of the electrode terminal and the cap plate ofFIG. 5 taken along the line VI-VI. Referring toFIG. 6 , in one embodiment, theresistance member 70 and theterminal plate 22 d are connected to an upper end of thecolumn unit 22 a by stacking and connecting theresistance member 70 and theterminal plate 22 d at the upper end of thecolumn unit 22 a of thesecond electrode terminal 22 for caulking the upper end. Therefore, theresistance member 70 and theterminal plate 22 d are supported by thecap plate 20. Here, theresistance member 70 electrically connects thecap plate 20 and thecolumn unit 22 a. - The
resistance member 70, in one embodiment, includes adownward protrusion 71 facing thecap plate 20, and anupward protrusion 73 facing theterminal plate 22 d. Thedownward protrusion 71 is coupled in agroove 72 of thecap plate 20 and theupward protrusion 73 is coupled to agroove 74 of theterminal plate 22 d in an assembled state in which thesecond electrode terminal 22 penetrates thecap plate 20. Thedownward protrusion 71 and thegroove 72 facilitate setting up an installation location of theresistance member 70 on thecap plate 20. Theupward protrusion 73 and thegroove 74 facilitate setting up an installation location of theterminal plate 22 d on theresistance member 70. - Referring to
FIG. 2 andFIG. 6 , thedeformable plate 53 and thesecond electrode terminal 22 form an electric connection path therebetween through thecap plate 20 and theresistance member 70. In case of external short-circuit, theresistance member 70 increases the external short-circuit resistance value between thefirst electrode terminal 21 and thesecond electrode terminal 22 without influencing the output through thefirst electrode terminal 21 and thesecond electrode terminal 22, thereby reducing the external short-circuit current. - The
resistance member 70, in one embodiment, has a resistance value higher than that of thecolumn unit 22 a, theterminal plate 22 d, and thecap plate 20. For example, in one embodiment, theterminal plate 22 d is formed of aluminum, and theresistance member 70 is formed of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar (Invar is a registered trademark of Imphy Alloys), also referred to as FeNi36 or 64FeNi. - When the
rechargeable battery 100 operates normally (i.e. when thedeformable plate 53 and the short-circuit tab 51 are separated as shown inFIG. 3 ), a first electric connection path L1 (seeFIG. 6 ) is formed between thecolumn unit 22 a of thesecond electrode terminal 22 and theterminal plate 22 d. In this case, theresistance member 70 does not influence the output of therechargeable battery 100 despite the high resistance value of theresistance member 70. - By contrast, when the
rechargeable battery 100 is externally short-circuited (i.e. when thedeformable plate 53 contacts the short-circuit tab 51 as shown inFIG. 4 ), a second electric connection path L2 (seeFIG. 6 ) is formed through thecolumn unit 22 a of thesecond electrode terminal 22, theterminal plate 22 d, theresistance member 70, and thecap plate 20. In this case, theresistance member 70 reduces the external short-circuit current by increasing the external short-circuit resistance value of the externally short-circuitedrechargeable battery 100. Therefore, the penetration characteristic of the external short-circuit current may be stabilized. Here, the external short-circuit current penetrates theelectrode assembly 10. - A rechargeable battery according to another exemplary embodiment of the present invention is described below. In view of the above description of the
rechargeable battery 100, only elements of the another exemplary embodiment differing from those of therechargeable battery 100 will be described, and description of same elements will not be repeated. -
FIG. 7 is a cross-sectional view illustrating a connected state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention. - A
rechargeable battery 200 according to another exemplary embodiment includes aresistance member 270 including amain body 271 and aplating layer 272 formed on a surface of themain body 271. Themain body 271, in one embodiment, is made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar. Theplating layer 272, in one embodiment, may be made of nickel (Ni) and/or tin (Sn). In theresistance member 270, theplating layer 272 prevents or substantially prevents themain body 271 from corroding. - When the
rechargeable battery 200 operates normally, the first electric connection path L1 is formed between thecolumn unit 22 a of thesecond electrode terminal 22 and theterminal plate 22 d. In one embodiment, themain body 271 and theplating layer 272 do not influence the output of the normally operatingrechargeable battery 200 although themain body 271 and theplating layer 272 have an electrical resistance value higher than thecolumn unit 22 a, theterminal plate 22 d, and thecap plate 20. - By contrast, when the
rechargeable battery 200 is externally short-circuited, the second electric connection path L2 is formed through thecolumn unit 22 a of thesecond electrode terminal 22, theterminal plate 22 d, themain body 271, theplating layer 272, and thecap plate 20. Here, themain body 271 and theplating layer 272 reduce the external short-circuit current by increasing the external short-circuit resistance value of the externally short-circuitedrechargeable battery 200. Therefore, the penetration characteristic of the external short-circuit current penetrating theelectrode assembly 10 is stabilized. -
FIG. 8 is an exploded perspective view illustrating a disassembled state of an electrode terminal (e.g., a positive electrode terminal) and a cap plate of a rechargeable battery according to another exemplary embodiment of the present invention.FIG. 9 is a cross-sectional view illustrating a connected state of the electrode terminal and the cap plate ofFIG. 8 taken along the line IX-IX. - A
rechargeable battery 400 according to another exemplary embodiment includes afirst resistance unit 371 and asecond resistance unit 372 made of different materials. - For example, the
first resistance unit 371 may be made of aluminum, and thesecond resistance unit 372 may be made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar, having an electrical resistance value higher than that of thefirst resistance unit 371. In one embodiment, thesecond resistance unit 372 has an electrical resistance value higher than the electrical resistance values of thecolumn unit 22 a, theterminal plate 22 d, and thecap plate 20. In one embodiment, thefirst resistance unit 371 may be made of at least one of stainless steel, steel, or a nickel steel alloy, such as Invar, and the second resistance unit may be made of aluminum. Further, in one embodiment, at least one of the first andsecond resistance units resistance member 270. - In one embodiment, the
first resistance unit 371 is connected to thecap plate 20 through adownward protrusion 71 facing thecap plate 20, and thesecond resistance unit 372 is coupled to theterminal plate 22 d through anupward protrusion 73 facing theterminal plate 22 d. In an assembled state in which thesecond electrode terminal 22 is assembled to thecap plate 20, thedownward protrusion 71 and thegroove 72 facilitate an installation location of thefirst resistance unit 371 on thecap plate 20, and theupward protrusion 73 and thegroove 74 facilitate an installation location of theterminal plate 22 d on thesecond resistance unit 372. - In one embodiment, the first electric connection path L1 is formed between the
column unit 22 a of thesecond electrode terminal 22 and theterminal plate 22 d when therechargeable battery 400 normally operates. The first andsecond resistance units rechargeable battery 400 despite the high electrical resistance value of the first andsecond resistance units - By contrast, when the
rechargeable battery 400 is externally short-circuited, the second electric connection path L2 is formed through thecolumn unit 22 a of thesecond electrode terminal 22, theterminal plate 22 d, the first andsecond resistance units cap plate 20. Here, the first andsecond resistance units rechargeable battery 400. Accordingly, the penetration characteristic of the external short-circuit current penetrating theelectrode assembly 10 may be stabilized. - While this invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (20)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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US13/077,640 US9478774B2 (en) | 2010-12-02 | 2011-03-31 | Rechargeable battery |
KR1020110036267A KR101244738B1 (en) | 2010-12-02 | 2011-04-19 | Rechargeable battery having resistance member |
EP11165265.7A EP2461393B1 (en) | 2010-12-02 | 2011-05-09 | Rechargeable Battery |
CN201110207662.2A CN102487135B (en) | 2010-12-02 | 2011-07-19 | Rechargeable battery |
JP2011170959A JP5481443B2 (en) | 2010-12-02 | 2011-08-04 | Secondary battery |
Applications Claiming Priority (2)
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Also Published As
Publication number | Publication date |
---|---|
KR101244738B1 (en) | 2013-03-18 |
EP2461393B1 (en) | 2014-05-14 |
KR20120060724A (en) | 2012-06-12 |
JP2012119303A (en) | 2012-06-21 |
CN102487135B (en) | 2015-10-21 |
CN102487135A (en) | 2012-06-06 |
EP2461393A1 (en) | 2012-06-06 |
US9478774B2 (en) | 2016-10-25 |
JP5481443B2 (en) | 2014-04-23 |
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